What was the very first clue that Kira threw in front of us? 'Dattebayo'. This is Naruto's first game and there is very less possibility that she is clever enough to forge it, hence there is very less possibility that she is Kira.
Which are the other names that he pointed out? Me and Asuka. Both of us never acted suspicious till that moment. He just had to divert things from team Kira and hence he went for three names that are easy to kill. Naruko and Asuka aren't experience enough and Me, who is obviously not Kira, since I know.
To test this further out, I asked him next question why am I kira? Then he said, that I am Kira, because I have vibe or something, not so strong argument in my opinion. This is typical human behavior when you are guilty, but need to find a reason to get out of it.
When I asked him for reason, he figured out that I am not to be taken lightly and voted for Naruko, because she is easier to kill.
^Either I looked too much into it or I am wrong and Naruko is Kira.